This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -3 |
| 3 | 3 |
| 4 | 1 |
| 5 | -30 |
| 6 | 5 |
| 7 | -15 |
| 8 | 7 |
| 9 | 1 |
| 10 | 2 |
| 11 | 4 |
| 12 | 16 |
| 13 | -1920 |
| 14 | 9 |
| 15 | 1 |
| 16 | 4 |
| 17 | 8 |
| 18 | 16 |
| 19 | 64 |
| 20 | -7680 |
| 21 | 11 |
| 22 | 1 |
| 23 | 2 |
| 24 | 8 |
| 25 | -960 |
| 26 | 13 |
| 27 | 1 |
| 28 | -120 |
| 29 | 15 |
| 30 | 1 |
| 31 | 2 |
| 32 | 4 |
| 33 | 8 |
| 34 | -3840 |
| 35 | 17 |
| 36 | 1 |
| 37 | 4 |
| 38 | -480 |
| 39 | 19 |
| 40 | 1 |
| 41 | 2 |
| 42 | 16 |
| 43 | 32 |
| 44 | 128 |
| 45 | -15360 |
| 46 | 21 |
| 47 | -63 |
| 48 | 23 |
| 49 | 1 |
| 50 | 2 |
| 51 | 4 |
| 52 | -1920 |
| 53 | 25 |
| 54 | 1 |
| 55 | 4 |
| 56 | 8 |
| 57 | 64 |
| 58 | 128 |
| 59 | 512 |
| 60 | -61440 |